Catch the Mistake! Conservation of Angular Momentum - By MITK12Videos
Transcript
| 00:0-1 | Mhm . When I hold the spinning wheel , nothing | |
| 00:04 | crazy absence . When I flip it , I spent | |
| 00:10 | the back and I stopped flip it . Yeah , | |
| 00:16 | I spent the question is why am I spinning ? | |
| 00:22 | So I have to force the were to turn over | |
| 00:25 | Now News . 3rd law says that for every force | |
| 00:27 | there's an equal and opposite force acting as well . | |
| 00:30 | So when I forced the wheel the wheel is applying | |
| 00:33 | force equal and opposite onto me housing me to turn | |
| 00:38 | . So the same thing applies when I'm on the | |
| 00:39 | ground . But the friction between my shoes and the | |
| 00:42 | ground stop me from spinning . So another would explain | |
| 00:45 | what's going on is through conservation of angular momentum . | |
| 00:49 | Now angular momentum is something that tells you how hard | |
| 00:52 | it is to either start or stop something from spinning | |
| 00:55 | . It depends on two things . one How fast | |
| 00:58 | it's spinning . You call that the english frequency to | |
| 01:03 | its shape or what we call the moment of inertia | |
| 01:06 | . So this wheels rotating counterclockwise . I'm gonna teach | |
| 01:09 | you a trick . So get your right hand . | |
| 01:11 | I want you to curl your fingers and the counter | |
| 01:13 | clockwise direction . And you see that your thumb is | |
| 01:16 | pointing upwards , we'll call that the positive direction . | |
| 01:20 | So see this wheel has positive angular momentum was a | |
| 01:23 | magnitude about anger . The momentum is conserved . That | |
| 01:28 | means as long as there's no outside forces , the | |
| 01:31 | total angular momentum of the system always stays the same | |
| 01:35 | . So when you flip this thing over you do | |
| 01:37 | the right hand trick your thumb points down or in | |
| 01:40 | the negative direction . So the annual met some of | |
| 01:43 | this wheel is now negative . So the whole system | |
| 01:47 | me the turntable and the wheel starts out at positive | |
| 01:51 | L . When you flip the wheel , the wheel | |
| 01:55 | now has negative out . So the whole system needs | |
| 01:58 | to stay at positive L . Because of conservation of | |
| 02:01 | angular momentum . So I need to spend with your | |
| 02:04 | meds um of positive to L . That's why I | |
| 02:08 | spend the other way |
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